@mixin bg-linear-gradient(c1,c2)
    background c1
    background -moz-linear-gradient(top, c1 0%, c2 100%)
    background -webkit-gradient(linear, left top, left bottom, color-stop(0%,c1), color-stop(100%,c2))
    background -webkit-linear-gradient(top, c1 0%, c2 100%)
    background -o-linear-gradient(top, c1 0%,c2 100%)
    background -ms-linear-gradient(top, c1 0%,c2 100%)
    background linear-gradient(to bottom, c1 0%,c2 100%)
